Locomotive fibe-box



UNITED sTATEs PATENT oEEioE.

WM. R. THOMAS, OF CATASAUQUA, PENNSYLVANIA.

LOCOMOTIVE FIRE-BOX.

Specification of Letters Patent No. 23,278, dated March 15, 1859.

To all whom 5t may concern:

Be it known that I, WILLIAM R. THOMAS, of Catasauqua, in the county of Lehigh and State of Pennsylvania, have invented a new and useful Improvement in Fire-Boxes for Locomotive and other Steam Boilers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this speciiication, in wh ich ,M

Figure l, is a longitudinal vertical section of a locomotive fire box with my improvement applied. Fig. 2, is a transverse verti cal section ot the same.

Similar letters of reference indicate corresponding parts in both figures.

This invention consists in a certain con struction of a hollow lining for the tire box of a locomotive or other boiler, and mode of combining the same with the water spaces of the fire box and body of the boiler, whereby provision is made for a free supply of water to the said lining and for the exit of the steam generated therein, and also for the removal of the said lining for repairs or for replacement by a new one when burned out.

To enable others to malre and use my invention I will proceed to describe its construction and operation.

A, is the fire-box of the usual construction except that the permanent water spaces a, cz, terminate all around some distance above the bottom, the shell o, only being continued to the bottom.

B, is the hollow lining which constitutes the principal portion of my invention, fitting into the shell below the permanent water spaces a, a, and extending all the way around close up against the bottom of the said water space and extending nearly to the bottom of the shell o. The inside of the back and front of this lining are flush with the inside of the permanent water space, but the sides are inclined inward toward the top, so as to project inward beyond the side water spaces a, a, and the projecting portions receive the lower ends of two rows of upright tubes o, c, which project upward through the crown sheet ol, of the lire-box the said tubes being parallel with and near the inner plates of the water spaces a, a. The back of the lining B, is connected with the body C, of the boiler, by a pipe e. The lining B, is secured in the fire box by bolts f, f, passing through the lower part of the shell and through a flanch g, provided on the bottom of the sai d lining. he tubes c, c, are secured by thimhles or otherwise in the usual modes of securing boiler tubes. The angle irons 7171, for supporting the grate bars are secured to the ends of the lining near the bottom thereof.

The lining B, and tubes o, c, present a very extensive heating surface, for the generation of steam the inclined sides of the lining being presented in a peculiarly effective manner overhanging the fire; and all the steam generated in the said lining and tubes finds its way upward through the said tubes into the upper part or steam room of the boiler.y while its place is supplied with water by the pipe c, so that a constant circulation through the lining is kept up. by taking out the bolts f, f, and unfastening the upper ends of the tubes (Z, (Z, it can be lowered through the bottom of the fire box and repaired and replaced, or a new one may be substituted at a comparatively small expense, without the necessity of putting in an entirely new tire-box, as is frequently necessary in an ordinary locomotive boiler, and without the necessity of any long stoppage for repair.

I do notclaim broadly the employment of a movable lining in a fire-box, but

What I claim as my invention and desire to secure by Let-ters Patent. is-

The removable lining B, fitting within the shell and under the permanent water spaces a, a, of the fire box, having inwardly projecting inclined sides and combined with the water spaces of the boiler by means of two rows of vertical tubes c, c, entering the crown sheet and a pipe c, connecting with the body of the boiler all substantially as herein described.

WILLIAM R. THOMAS. 7i tnesses V. W. WEAVER. JASPER HUNT.

W hen the lining B, is burned out, 

